From c82dbe5c055e4d246bd07c4d7b24801c9445c241 Mon Sep 17 00:00:00 2001 From: Arnaud Pouliquen Date: Tue, 3 Jan 2017 16:52:50 +0100 Subject: [PATCH] DRM: add help to get ELD speaker allocation Add helper to allow users to retrieve the speaker allocations without knowledge of the ELD structure. Signed-off-by: Arnaud Pouliquen Reviewed-by: Jani Nikula Signed-off-by: Mark Brown --- include/drm/drm_edid.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index c3a7d440bc11..de93543d1218 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -248,6 +248,7 @@ struct detailed_timing { # define DRM_ELD_AUD_SYNCH_DELAY_MAX 0xfa /* 500 ms */ #define DRM_ELD_SPEAKER 7 +# define DRM_ELD_SPEAKER_MASK 0x7f # define DRM_ELD_SPEAKER_RLRC (1 << 6) # define DRM_ELD_SPEAKER_FLRC (1 << 5) # define DRM_ELD_SPEAKER_RC (1 << 4) @@ -414,6 +415,18 @@ static inline int drm_eld_size(const uint8_t *eld) return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4; } +/** + * drm_eld_get_spk_alloc - Get speaker allocation + * @eld: pointer to an ELD memory structure + * + * The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER + * field definitions to identify speakers. + */ +static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld) +{ + return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK; +} + /** * drm_eld_get_conn_type - Get device type hdmi/dp connected * @eld: pointer to an ELD memory structure -- 2.20.1